The only thing that I have grown to despise a bit is timeboxing. Coding is a job and a hobby to me, and sometimes setting those hard limits kills my ability to improve code by forcing me into a rigid schedule. It turns what I view as play into unpleasant work, and that's how burnout starts.

Sometimes its faster to come up with a solution without setting hard time limits, and just let your mind churn passively on a concept. I've always found a certain amount of anxiety associated with feeling like I have to complete a task in a predetermined amount of time.

You should always have (and try to meet) deadlines, but the micromanagement of 25 mins per hour (example from the article) is just stressful.